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matter, motion, causes

What are the core concepts of physics

translation

linear movement

rotation and reflection

What do you need to move a real shape somewhere

reflection

a wave strikes a boundary and bounces back

Radian

An angle whose arc length is equal to its radius

1 radian

the angle when the arc around the circle equals the radius

translation and rotation

what do objects with form need to fully explain their motion

rotational kinematics

our units are built up from seconds for time and radians for angle

frame of reference

assists one in physics in which one chooses a place (point) a measure it against changes in position.

counter clockwise

when is torque positive

clockwise

Angular velocity is negative if the rotation is . . .

s

arc

angular velocity

represented by a lower case omega (ω)

radians per second

What is angular velocity measured in

Tangential velocity

A velocity parallel to the Earth's surface

Angular acceleration

represented by a lower case alpha (α)

radians per second sqaured

What is angular acceleration measured in

our direction keeps changing

Even with a constant tangential velocity why do we still accelerate

centripetal acceleration

a = centripetal acceleration

centripetal

center seeking

centripetal accelration

emerges from uniform circular motion that seeks the center because tangential velocity keeps changing direction

meters per second squared

what is centripetal acceleration measured in

it only feels like we're pulled away because our frame of reference; Newton's first law still applies

Why do we feel pulled away from the center when in uniform circular motion if the centripetal acceleration is center seeking

Torque

A "force" that causes rotation because it is exerted at a distance from the axis of rotation.

inertia

_______ is the property of an object that leads it to resist any change in motion

moment of inertia

rotational inertia; depends on the mass, radius, and axis of rotation

angular momentum

analogous to momentum; if the net torque on a system is zero then the angular momentum is conserved

Center of mass

same as center of gravity

a parabola

what does the center of mass follow when in projectile motion

if it can move down to topple

what decides if an object's center of mass is unstable

it is moves up to topple

What decides if an object's center of mass is stable

Why is an equilibrium unstable

because any displacement lowers the center of mass

Why is an equilibrium stable

because work must be done to raise the center of mass

Angular displacement

displayed as the change in theta (∆θ)

radias

how is angular displacement measured

Meters per second

SI Unit for Average Velocity/Speed

Newtons

This is the unit of measurement for force.

newton per meter

what is torque measured in

point mass, rotational motion

If we model an object as a _______ we can fully explain its motion with translation. But if we model an object with form, we need to also consider _______ to fully explain its motion